It's just inside your main entry door on the left. There should be a panel there with four screws. You can see it when standing outside. Take the four screws off and the pump is right there.
The panel may have a heat duct in it. In that case, you'll have to work around the duct to get to the pump.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR